Purple Butt has for 3 days now gone into the nesting box, spends about 30 minutes in there. Nothing to show for it. Today I seen her in there, waited and as soon as she left it, she came out, and was making all kinds of racket. Loudly telling me she had laid an egg. I was thrilled. Walked in and no egg. ??? I thought maybe it wasn't a egg persay as maybe this was her first, but no traces of anything? Can she be practicing? or is there something else going on? They shouldn't have issues before they start to lay should they?? Any help will be aprreciated.... She is almost 18 weeks. On layer crumble, has free oyster shells at her disposal, and eats and drinks well. She is a white leghorn.